/*
 * Copyright 2009, 2010, YUNNAN Co-soft Information Technology Co., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cs.website.client.captcha;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageInputStream;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * CaptchaGenerator generator for <a href="http://code.google.com/p/co-soft">
 * CaptchaGenerator</a> configurations.
 *
 * @author <a href="mailto:toughPatient5@gmail.com">Gang Liu</a>
 * @version 1.0.0.0, Apr 29, 2010
 */
public class CaptchaServlet extends HttpServlet {

    public static final String CAP_STRING = "capString";
    public static final int BUFF_SIZE = 1024;

    public void doGet(final HttpServletRequest request,
            final HttpServletResponse response) throws IOException,
            ServletException {
        doPost(request, response);
    }

    //Generats image for client and answer saved to HttpSession
    public void doPost(final HttpServletRequest request,
            final HttpServletResponse response) throws IOException,
            ServletException {
        final CaptchaUnit cap = CaptchaGenerator.getCattcha();
        final HttpSession session = request.getSession();
        session.setAttribute(CAP_STRING, cap.getText());

        final OutputStream respon = response.getOutputStream();

        final File tempFile = File.createTempFile("temprory", "te3mpCat");
        ImageIO.write(cap.getImg(), "PNG", tempFile);
        final ImageInputStream source = ImageIO.createImageInputStream(tempFile);
        final byte[] buff = new byte[BUFF_SIZE];
        while (source.read(buff) > 0) {
            respon.write(buff);
        }
        tempFile.delete();
        respon.close();
        source.close();
    }
}
